exam Maths Puzzle Numerical Ability

Assume that y varies inversely as x. If y = 3.2 when x =0.2, find y when x =1.6

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Please help me pick the correct answer.

If x-y=6 and 3x^2+3xy-6y^2=60, then 9x+18y=

Answers:
a) 12
b) 15
c) 20
d) 24
e) 30 Multiply. (a - 3)(a - 7)